TW201444256A - Apparatus and method for implementing a multiple function pin in a BCM power supplier - Google Patents
Apparatus and method for implementing a multiple function pin in a BCM power supplier Download PDFInfo
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- TW201444256A TW201444256A TW102115895A TW102115895A TW201444256A TW 201444256 A TW201444256 A TW 201444256A TW 102115895 A TW102115895 A TW 102115895A TW 102115895 A TW102115895 A TW 102115895A TW 201444256 A TW201444256 A TW 201444256A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Electronic Switches (AREA)
Abstract
Description
本發明係有關一種邊界導通模式(Boundary Conduction Mode；BCM)電源供應器供，特別是關於一種應用在BCM電源供應器供實現多功能腳位的裝置及方法。 The present invention relates to a Boundary Conduction Mode (BCM) power supply, and more particularly to an apparatus and method for implementing a multi-function pin in a BCM power supply.
傳統的升壓式、馳返式及降壓式等BCM電源供應器都需要一支腳位來達成零電流偵測(Zero Current Detector；ZCD)以決定功率開關的切換。圖1為習知升壓式BCM電源供應器，其中整流器10整流交流電壓Vac產生輸入電壓Vin，電感L1、功率開關M及二極體D1組成非同步式功率級，控制積體電路(Integrated Circuit；IC)12具有腳位14用以控制功率開關M1以使該功率級將輸入電壓Vin轉換為輸出電壓Vo，輔助線圈La感測電感L1的電壓變化，當電流為0時產生感測信號VZCD至控制IC 12的腳位16，控制IC 12根據感測信號VZCD判斷電感電流IL降為零的時間點，並在電感電流IL降為零時打開(turn on)功率開關M1。 Traditional BCM power supplies such as boost, flyback, and buck require a pin to achieve Zero Current Detector (ZCD) to determine the switching of the power switch. 1 is a conventional boost type BCM power supply, in which a rectifier 10 rectifies an AC voltage Vac to generate an input voltage Vin, an inductor L1, a power switch M, and a diode D1 constitute an asynchronous power stage, and an integrated circuit (IC) is integrated. 12 has a pin 14 for controlling the power switch M1 to cause the power stage to convert the input voltage Vin into an output voltage Vo, the auxiliary coil La senses a voltage change of the inductor L1, and when the current is 0, generates a sensing signal V ZCD to The pin 16 of the control IC 12 controls the IC 12 to determine the time point at which the inductor current IL drops to zero based on the sense signal V ZCD , and turns on the power switch M1 when the inductor current IL drops to zero.
圖2是習知半諧振馳返式(quasi-resonant flyback)BCM電源供應器，其中整流器10整流交流電壓Vac產生輸入電壓Vin，作為一次側線圈的電感Lp連接在整流器10及功率開關M1之間，作為二次側線圈的電感Ls連接在輸出端Vo及接地端之間，控制IC 20的腳位22控制功率開關M1的切換以將輸入電壓Vin轉換為輸出電壓Vo，輔助線圈La感測電感Ls的電感電流Is產生零電流感測信號VZCD至控制IC 20的腳位24以供控制IC 20判斷電感電流Is降為零的時間點，在電感電流IL降為零時，控制IC 20打開功率開關M1。 2 is a conventional semi-resonant flyback BCM power supply in which a rectifier 10 rectifies an AC voltage Vac to generate an input voltage Vin, and an inductance Lp as a primary side coil is connected between the rectifier 10 and the power switch M1. The inductor Ls as the secondary side coil is connected between the output terminal Vo and the ground terminal, and the pin 22 of the control IC 20 controls the switching of the power switch M1 to convert the input voltage Vin into the output voltage Vo, and the auxiliary coil La senses the inductance. The inductor current Is of Ls generates a zero current sense signal V ZCD to the pin 24 of the control IC 20 for the control IC 20 to determine when the inductor current Is drops to zero. When the inductor current IL drops to zero, the control IC 20 turns on. Power switch M1.
圖3是習知降壓式BCM電源供應器，其中控制IC 30的腳 位32控制功率開關M1的切換以使電感L充放電而產生穩定的電流ILED給LED串36，由電阻Rf1、Rf2及Rf3以及電容Cf組成的濾波電路38偵測電感L1的電感電流IL，並在電感電流IL降為零時送出零電流感測信號VZCD至控制IC 30的腳位34，控制IC 30根據感測信號VZCD打開功率開關M1。 3 is a conventional buck BCM power supply, in which the pin 32 of the control IC 30 controls the switching of the power switch M1 to charge and discharge the inductor L to generate a stable current ILED to the LED string 36, by the resistors Rf1, Rf2 and The filter circuit 38 composed of Rf3 and the capacitor Cf detects the inductor current IL of the inductor L1, and sends a zero current sense signal V ZCD to the pin 34 of the control IC 30 when the inductor current IL drops to zero, and the control IC 30 senses the sensor. Signal V ZCD turns on power switch M1.
由圖1至圖3可知，傳統的BCM電源供應器需要二支腳位分別驅動功率開關M1及偵測零電流，如果用一支多功能腳位就能驅動功率開關M1及偵測零電流，將可以減少控制IC的腳位數量及成本。美國專利第7,355,373號提出一種BCM電源供應器，其利用一支多功能腳位上的信號來驅動功率開關及偵測零電流，但是此BCM電源供應器的控制IC無法打開功率開關，其需要由控制IC外部的電路來打開功率開關，因此使用者必須自行設定外部電路的參數使該功率開關可以被打開及關閉(turn off)，造成使用者的不便。 As can be seen from FIG. 1 to FIG. 3, the conventional BCM power supply requires two pins to respectively drive the power switch M1 and detect zero current. If a multi-function pin is used, the power switch M1 can be driven and the zero current can be detected. It will reduce the number and cost of the control IC's pin. U.S. Patent No. 7,355,373 discloses a BCM power supply that utilizes a signal on a multi-function pin to drive a power switch and detect zero current, but the control IC of the BCM power supply cannot turn on the power switch, which requires The circuit outside the control IC is turned on to turn on the power switch, so the user must set the parameters of the external circuit so that the power switch can be turned on and off, causing inconvenience to the user.
本發明的目的之一，在於提出一種應用在BCM電源供應器供實現多功能腳位的裝置及方法。 One of the objects of the present invention is to provide an apparatus and method for implementing a multi-function foot in a BCM power supply.
本發明的目的之一，在於提出一種使用單一腳位來驅動功率開關及達成零電流偵測的裝置及方法。 One of the objects of the present invention is to provide an apparatus and method for driving a power switch using a single pin and achieving zero current detection.
根據本發明，一種應用在BCM電源供應器供實現多功能腳位的裝置包括三態輸出驅動器、零電流訊號產生電路、零電流偵測器及箝制電路。該三態輸出驅動器在被啟動時提供第一電壓以打開功率開關，並在該功率開關打開一第一時間後提供第二電壓以關閉該功率開關，其中該三態輸出驅動器在功率開關關閉一第二時間後被關閉。該零電流訊號產生電路偵測電感的電壓變化，以在該電感的電感電流為零時送出感測信號至該多功能腳位。該零電流偵測器偵測該多功能腳位的電壓，在該多功能腳位的電壓達到臨界值時，送出零電流信號以啟動該三態輸出驅動器。該箝制電路在該三態輸出驅動器關閉期間，提供第三電壓以關閉該功率開關。 In accordance with the present invention, a device for use in a BCM power supply for implementing a multi-function pin includes a tri-state output driver, a zero current signal generating circuit, a zero current detector, and a clamp circuit. The tristate output driver provides a first voltage to turn on the power switch when activated, and provides a second voltage to turn off the power switch after the power switch is turned on for a first time, wherein the tristate output driver is turned off at the power switch It was closed after the second time. The zero current signal generating circuit detects a voltage change of the inductor to send a sensing signal to the multi-function pin when the inductor current of the inductor is zero. The zero current detector detects the voltage of the multi-function pin, and when the voltage of the multi-function pin reaches a critical value, sends a zero current signal to activate the tri-state output driver. The clamp circuit provides a third voltage to turn off the power switch during the off state of the tristate output driver.
根據本發明，一種應用在BGM電源供應器供實現多功能腳位的方法包括提供第一電壓至該多功能腳位以打開功率開關；在該功率開 關打開一第一時間後，提供第二電壓至該多功能腳位以關閉該功率開關；在該功率開關關閉一第二時間後，提供第三電壓至該多功能腳位以關閉該功率開關；偵測電感的電壓變化，以在該電感的電感電流為零時送出感測信號至該多功能腳位；以及偵測該多功能腳位的電壓，在該多功能腳位的電壓達到臨界值時，觸發零電流信號以提供該第一電壓打開該功率開關。 According to the present invention, a method for implementing a multi-function pin in a BGM power supply includes providing a first voltage to the multi-function pin to turn on a power switch; After being turned off for a first time, providing a second voltage to the multi-function pin to turn off the power switch; after the power switch is turned off for a second time, providing a third voltage to the multi-function pin to turn off the power switch Detecting a voltage change of the inductor to send a sensing signal to the multi-function pin when the inductor current of the inductor is zero; and detecting a voltage of the multi-function pin, the voltage at the multi-function pin reaches a critical value At the time of the value, a zero current signal is triggered to provide the first voltage to turn the power switch on.
10‧‧‧整流器 10‧‧‧Rectifier
12‧‧‧控制IC 12‧‧‧Control IC
14‧‧‧控制IC 12的腳位 14‧‧‧Control IC 12 pin
16‧‧‧控制IC 12的腳位 16‧‧‧Control IC 12 pin
20‧‧‧控制IC 20‧‧‧Control IC
22‧‧‧控制IC 20的腳位 22‧‧‧Control IC 20 pin
24‧‧‧控制IC 20的腳位 24‧‧‧Control IC 20's pin
30‧‧‧控制IC 30‧‧‧Control IC
32‧‧‧控制IC 30的腳位 32‧‧‧Control IC 30's pin
34‧‧‧控制IC 30的腳位 34‧‧‧Control IC 30's pin
36‧‧‧LED串 36‧‧‧LED string
38‧‧‧濾波電路 38‧‧‧Filter circuit
40‧‧‧用以實現多功能腳位的裝置 40‧‧‧Devices for achieving multifunctional feet
42‧‧‧箝制電路 42‧‧‧Clamping circuit
44‧‧‧零電流訊號產生電路 44‧‧‧Zero current signal generation circuit
46‧‧‧三態輸出驅動器 46‧‧‧Three-state output driver
48‧‧‧控制電路 48‧‧‧Control circuit
50‧‧‧零電流偵測器 50‧‧‧zero current detector
52‧‧‧及閘 52‧‧‧ and gate
54‧‧‧運算放大器 54‧‧‧Operational Amplifier
56‧‧‧電流源 56‧‧‧current source
58‧‧‧比較器 58‧‧‧ comparator
圖1係習知升壓式BCM電源供應器；圖2係習知半諧振馳返式BCM電源供應器；圖3係習知降壓式BCM電源供應器；圖4顯示本發明的第一實施例；圖5係圖4中訊號的波形圖；以及圖6顯示本發明的第二實施例。 1 is a conventional boost type BCM power supply; FIG. 2 is a conventional semi-resonant flyback BCM power supply; FIG. 3 is a conventional buck BCM power supply; FIG. 4 shows a first embodiment of the present invention; Figure 5 is a waveform diagram of the signal in Figure 4; and Figure 6 shows a second embodiment of the present invention.
圖4顯示應用本發明第一實施例的升壓式BCM電源供應器，其中電感L1、功率開關M1及二極體D2組成非同步式功率級，本發明用以實現多功能腳位的裝置40藉由多功能腳位GD控制功率開關M1以使該功率級將輸入電壓Vin轉換為輸出電壓Vo，同時利用此多功能腳位GD達成零電流偵測。用以實現多功能腳位的裝置40包括箝制電路42、預設電阻Rp、零電流訊號產生電路44、三態輸出驅動器46、控制電路48、零電流偵測器50和及閘52。箝制電路42包括運算放大器54、致能開關SW、電晶體M2及電流源56，運算放大器54的反相輸入端接收參考電壓Vref，運算放大器54的非反相輸入端連接多功能腳位GD，致能開關SW、電晶體M2及電流源56串聯在多功能腳位GD及接地端之間，致能開關SW受控於控制信號Sen，當致能開關SW被打開(turn on)時，箝制電路42被啟動，根據虛短路原理，運算放大器54的反相輸入端的參考電壓Vref將被施加至多功能腳位GD。零電流訊號產生電路44包括輔助線圈L2用以感應電感 L1的跨壓產生與電感電流IL相關的電壓Vs，以及電容Cr及電阻Rr串聯在輔助線圈L2及多功能腳位之間，其中電容Cr用以濾除電壓Vs的低頻成份以產生感測信號VZCD，而電阻Rr為限流電阻。三態輸出驅動器46包括開關M3連接在電源端Vcc及多功能腳位GD之間以及開關M4連接在多功能腳位及接地端GND之間。控制電路48提供控制信號GD_H、GD_L及Sen分別控制開關M3、M4及SW。零電流偵測器50包括偏移電壓源Vth用以偏移多功能腳位GD的電壓產生電壓Vof，以及比較器58比較參考電壓Vrefz及電壓Vof，當參考電壓Vrefz大於電壓Vof時，比較器58產生零電流信號Szcd1。為了避免零電流信號Szcd1被誤觸發而導致誤動作，及閘52利用控制信號Sen來遮蔽非預期的零電流信號Szcd1產生零電流信號Szcd2。 4 shows a boosting BCM power supply to which the first embodiment of the present invention is applied, wherein the inductor L1, the power switch M1 and the diode D2 form a non-synchronous power stage, and the device 40 for implementing the multifunctional foot of the present invention The power switch M1 is controlled by the multi-function pin GD to cause the power stage to convert the input voltage Vin into the output voltage Vo, and the zero-current detection is achieved by using the multi-function pin GD. The device 40 for implementing the multi-function pin includes a clamp circuit 42, a preset resistor Rp, a zero current signal generating circuit 44, a tri-state output driver 46, a control circuit 48, a zero current detector 50, and a gate 52. The clamp circuit 42 includes an operational amplifier 54, an enable switch SW, a transistor M2, and a current source 56. The inverting input terminal of the operational amplifier 54 receives the reference voltage Vref, and the non-inverting input terminal of the operational amplifier 54 is connected to the multi-function pin GD. The enable switch SW, the transistor M2 and the current source 56 are connected in series between the multi-function pin GD and the ground terminal, and the enable switch SW is controlled by the control signal Sen, and is clamped when the enable switch SW is turned on. The circuit 42 is activated, and according to the virtual short circuit principle, the reference voltage Vref of the inverting input of the operational amplifier 54 is applied to the multi-function pin GD. The zero current signal generating circuit 44 includes an auxiliary coil L2 for sensing a voltage Vs related to the inductor current IL across the voltage across the inductor L1, and a capacitor Cr and a resistor Rr connected in series between the auxiliary coil L2 and the multi-function pin, wherein the capacitor Cr The low frequency component of the voltage Vs is filtered to generate the sensing signal V ZCD , and the resistor Rr is a current limiting resistor. The three-state output driver 46 includes a switch M3 connected between the power supply terminal Vcc and the multi-function pin GD, and a switch M4 connected between the multi-function pin and the ground GND. Control circuit 48 provides control signals GD_H, GD_L, and Sen to control switches M3, M4, and SW, respectively. The zero current detector 50 includes an offset voltage source Vth for shifting the voltage generating voltage Vof of the multi-function pin GD, and the comparator 58 compares the reference voltage Vrefz and the voltage Vof. When the reference voltage Vrefz is greater than the voltage Vof, the comparator 58 produces a zero current signal Szcd1. In order to prevent the zero current signal Szcd1 from being erroneously triggered to cause a malfunction, the gate 52 uses the control signal Sen to shield the unintended zero current signal Szcd1 to generate a zero current signal Szcd2.
圖5係圖4中信號的波形圖，用以說明圖4的裝置40的操作。參照圖4及圖5，在時間t1時，控制電路48輸出控制信號GD_H以使三態輸出驅動器46的開關M3打開，三態輸出驅動器46因而被啟動並送出電壓Vcc至多功能腳位GD以打開功率開關M1，此時電感電流IL上升。在功率開關M1打開一段時間Ton後，如時間t2所示，控制電路48結束控制信號GD_H並輸出控制信號GD_L以使三態輸出驅動器46的開關M4打開，三態輸出驅動器46因而送出電壓GND=0V至多功能腳位GD以關閉功率開關M1，此時電感電流IL開始下降。在功率開關M1關閉一段時間Toff後，如時間t3所示，控制電路48結束控制信號GD_L並輸出控制信號Sen，此時三態輸出驅動器46被關閉，其可以視為高阻抗元件，同時箝制電路42被致能因而提供電壓Vref至多功能腳位GD使功率開關M1維持關閉，此時多功能腳位GD的輸出阻抗係由預設電阻Rp決定。在功率開關M1關閉期間，如時間t2至t4，電感電流IL下降，功率開關M1的輸入端的電壓VD隨著電感電流IL慢慢下降，此時輔助線圈L2的電壓Vs為低頻信號，故電壓Vs被電容Cr阻擋而無法傳遞至多功能腳位。當電感電流IL降為零時，如時間T4所示，電壓VD等於輸入電壓Vin，此時電壓VD將出現高頻振盪，輔助線圈L2的電壓Vs也因而產生高頻振盪，此時的電壓Vs將通過電容Cr形成感測信號VZCD施加至多功能腳位GD，多功能腳位 GD的電壓因而被拉至負電壓。電壓Vof隨著多功能腳位GD的電壓下降而下降，當電壓Vof低於參考電壓Vrefz時，如時間t5所示，比較器58送出零電流信號Szcd1，及閘52根據信號Szcd1及Sen產生零電流信號Szcd2給控制電路48，控制電路48在收到零電流信號Szcd2後，結束控制信號Sen並輸出控制信號GD_H以啟動三態輸出驅動器46，接著重覆之前所述的操作。 Figure 5 is a waveform diagram of the signal of Figure 4 to illustrate the operation of the apparatus 40 of Figure 4. Referring to Figures 4 and 5, at time t1, control circuit 48 outputs control signal GD_H to cause switch M3 of tri-state output driver 46 to be turned on, and tri-state output driver 46 is thereby activated and sends voltage Vcc to multi-function pin GD to open. The power switch M1, at this time, the inductor current IL rises. After the power switch M1 is turned on for a period of time Ton, as indicated by time t2, the control circuit 48 ends the control signal GD_H and outputs a control signal GD_L to turn on the switch M4 of the tri-state output driver 46, and the tri-state output driver 46 thus sends the voltage GND= 0V to the multi-function pin GD to turn off the power switch M1, at which time the inductor current IL begins to drop. After the power switch M1 is turned off for a period of time Toff, as indicated by time t3, the control circuit 48 ends the control signal GD_L and outputs the control signal Sen, at which time the tristate output driver 46 is turned off, which can be regarded as a high impedance component while clamping the circuit 42 is enabled to provide a voltage Vref to the multi-function pin GD to maintain the power switch M1 closed, and the output impedance of the multi-function pin GD is determined by the preset resistor Rp. During the shutdown of the power switch M1, as time t2 to t4, the inductor current IL decreases, and the voltage VD at the input end of the power switch M1 gradually decreases with the inductor current IL. At this time, the voltage Vs of the auxiliary coil L2 is a low frequency signal, so the voltage Vs Blocked by capacitor Cr and cannot be transmitted to the multi-function pin. When the inductor current IL drops to zero, as shown by time T4, the voltage VD is equal to the input voltage Vin, at which time the high-frequency oscillation occurs in the voltage VD, and the voltage Vs of the auxiliary coil L2 also generates high-frequency oscillation, and the voltage Vs at this time The sensing signal V ZCD is formed by the capacitance Cr to be applied to the multi-function pin GD, and the voltage of the multi-function pin GD is thus pulled to a negative voltage. The voltage Vof decreases as the voltage of the multi-function pin GD decreases. When the voltage Vof is lower than the reference voltage Vrefz, as shown by time t5, the comparator 58 sends a zero current signal Szcd1, and the gate 52 generates zero according to the signals Szcd1 and Sen. The current signal Szcd2 is supplied to the control circuit 48. Upon receipt of the zero current signal Szcd2, the control circuit 48 terminates the control signal Sen and outputs a control signal GD_H to activate the tristate output driver 46, and then repeats the previously described operation.
圖6顯示本發明用以實現多功能腳位的裝置40的第二實施例，其與圖4的電路同樣包括箝制電路42、預設電阻Rp、零電流訊號產生電路44、三態輸出驅動器46、控制電路48、零電流偵測器50和及閘52，但是使用在電感L1及多功能腳位GD之間的高壓電容Chv來作為零電流訊號產生電路44，在此實施例中高壓電容Chv可以是外加的電容或是功率開關M1的輸入端及控制端之間的寄生電容。參照圖5及圖6，箝制電路42、三態輸出驅動器46、控制電路48、零電流偵測器50和及閘52的操作如前所述。在功率開關M1關閉期間，如時間t2至t4，電感電流IL下降，功率開關M1的輸入端的電壓VD隨著電感電流IL慢慢下降，此時電壓VD為低頻信號，故電壓Vs被電容Chv阻擋而無法傳遞至多功能腳位。當電感電流IL降為零時，如時間T4所示，電壓VD將出現高頻振盪，電壓Vs將通過電容Chv形成感測信號VZCD施加至多功能腳位GD，多功能腳位GD的電壓因而被拉至負電壓。 6 shows a second embodiment of the apparatus 40 for implementing a multi-function pod of the present invention. The same as the circuit of FIG. 4, the clamp circuit 42, the preset resistor Rp, the zero current signal generating circuit 44, and the tri-state output driver 46 are shown. The control circuit 48, the zero current detector 50 and the AND gate 52, but using the high voltage capacitor Chv between the inductor L1 and the multifunction pin GD as the zero current signal generating circuit 44, in this embodiment the high voltage capacitor Chv It can be an external capacitor or a parasitic capacitance between the input and control terminals of the power switch M1. Referring to Figures 5 and 6, the operation of clamp circuit 42, tri-state output driver 46, control circuit 48, zero current detector 50, and AND gate 52 are as previously described. During the shutdown of the power switch M1, as time t2 to t4, the inductor current IL decreases, and the voltage VD at the input end of the power switch M1 gradually decreases with the inductor current IL. At this time, the voltage VD is a low frequency signal, so the voltage Vs is blocked by the capacitor Chv. It cannot be passed to the multi-function foot. When the inductor current IL drops to zero, as shown by time T4, the voltage VD will exhibit high frequency oscillation, and the voltage Vs will be applied to the multi-function pin GD through the capacitance Chv forming the sensing signal V ZCD , and thus the voltage of the multi-function pin GD Was pulled to a negative voltage.
在前述的實施例中，雖然僅以升壓式BCM電源供應器為例，但本發明可以應用在任何類型的BCM電源供應器，例如馳返式及降壓式BCM電源供應器。 In the foregoing embodiments, although only the boost BCM power supply is taken as an example, the present invention can be applied to any type of BCM power supply, such as a flyback and buck BCM power supply.
以上對於本發明之較佳實施例所作的敘述係為闡明之目的，而無意限定本發明精確地為所揭露的形式，基於以上的教導或從本發明的實施例學習而作修改或變化是可能的，實施例係為解說本發明的原理以及讓熟習該項技術者以各種實施例利用本發明在實際應用上而選擇及敘述，本發明的技術思想由以下的申請專利範圍及其均等來決定。 The above description of the preferred embodiments of the present invention is intended to be illustrative, and is not intended to limit the scope of the invention to the disclosed embodiments. It is possible to make modifications or variations based on the above teachings or learning from the embodiments of the present invention. The embodiments are described and illustrated in the practical application of the present invention in various embodiments, and the technical idea of the present invention is determined by the following claims and their equals. .
40‧‧‧用以實現多功能腳位的裝置 40‧‧‧Devices for achieving multifunctional feet
42‧‧‧箝制電路 42‧‧‧Clamping circuit
44‧‧‧零電流訊號產生電路 44‧‧‧Zero current signal generation circuit
46‧‧‧三態輸出驅動器 46‧‧‧Three-state output driver
48‧‧‧控制電路 48‧‧‧Control circuit
50‧‧‧零電流偵測器 50‧‧‧zero current detector
52‧‧‧及閘 52‧‧‧ and gate
54‧‧‧運算放大器 54‧‧‧Operational Amplifier
56‧‧‧電流源 56‧‧‧current source
58‧‧‧比較器 58‧‧‧ comparator
Claims (12)
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| TW102115895A TWI499190B (en) | 2013-05-03 | 2013-05-03 | Apparatus and method for implementing a multiple function pin in a bcm power supplier |
| CN201310206737.4A CN104135152B (en) | 2013-05-03 | 2013-05-29 | Device and method applied to BCM power supply for realizing multifunctional pin |
| US14/266,566 US9450486B2 (en) | 2013-05-03 | 2014-04-30 | Apparatus and method for implementing a multiple function pin in a BCM power supply |
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| TW102115895A TWI499190B (en) | 2013-05-03 | 2013-05-03 | Apparatus and method for implementing a multiple function pin in a bcm power supplier |
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| TWI669586B (en) * | 2018-11-15 | 2019-08-21 | 康舒科技股份有限公司 | Primary side integrated circuit module of power supply |
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| JP6346955B2 (en) * | 2014-01-17 | 2018-06-20 | ユニバーシティ オブ バージニア パテント ファウンデーション ディー／ビー／エイ ユニバーシティ オブ バージニア ライセンシング アンド ベンチャーズ グループＵｎｉｖｅｒｓｉｔｙ Ｏｆ Ｖｉｒｇｉｎｉａ Ｐａｔｅｎｔ Ｆｏｕｎｄａｔｉｏｎ，Ｄ／Ｂ／Ａ Ｕｎｉｖｅｒｓｉｔｙ Ｏｆ Ｖｉｒｇｉｎｉａ Ｌｉｃｅｎｓｉｎｇ ＆ Ｖｅｎｔｕｒｅｓ Ｇｒｏｕｐ | Boost converter with peak inductor current control |
| KR101654785B1 (en) * | 2015-03-31 | 2016-09-22 | 주식회사 실리콘마이터스 | Buck-converter bcm control apparatus and method thereof |
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| CN106253670A (en) * | 2016-08-23 | 2016-12-21 | 深圳市华星光电技术有限公司 | Booster circuit and back light |
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| TWI664799B (en) * | 2018-02-13 | 2019-07-01 | 友達光電股份有限公司 | Voltage converter |
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| TWI669586B (en) * | 2018-11-15 | 2019-08-21 | 康舒科技股份有限公司 | Primary side integrated circuit module of power supply |
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| US20140328087A1 (en) | 2014-11-06 |
| US9450486B2 (en) | 2016-09-20 |
| CN104135152A (en) | 2014-11-05 |
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| CN104135152B (en) | 2017-04-12 |
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